Write the magic number 0xf5f5dcdc into a script snapshot file and use this to distinguish whether a…

runtime/vm/snapshot_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_message.h"
@@ skipping 1112 matching lines @@
   }
 
   {
     // Now Create an Isolate using the full snapshot and load the
     // script snapshot created above and execute it.
     TestCase::CreateTestIsolateFromSnapshot(full_snapshot);
     Dart_EnterScope();  // Start a Dart API scope for invoking API functions.
 
     // Load the test library from the snapshot.
     EXPECT(script_snapshot != NULL);
-    result = Dart_LoadScriptFromSnapshot(script_snapshot);
+    result = Dart_LoadScriptFromSnapshot(script_snapshot, size);
     EXPECT_VALID(result);
 
     // Get list of library URLs loaded and compare with expected count.
     Dart_Handle libs = Dart_GetLibraryURLs();
     EXPECT(Dart_IsList(libs));
     Dart_ListLength(libs, &actual_num_libs);
 
     EXPECT_EQ(expected_num_libs, actual_num_libs);
 
     // Invoke a function which returns an object.
@@ skipping 53 matching lines @@
   }
 
   {
     // Now Create an Isolate using the full snapshot and load the
     // script snapshot created above and execute it.
     TestCase::CreateTestIsolateFromSnapshot(full_snapshot);
     Dart_EnterScope();  // Start a Dart API scope for invoking API functions.
 
     // Load the test library from the snapshot.
     EXPECT(script_snapshot != NULL);
-    result = Dart_LoadScriptFromSnapshot(script_snapshot);
+    result = Dart_LoadScriptFromSnapshot(script_snapshot, size);
     EXPECT_VALID(result);
   }
   Dart_ShutdownIsolate();
   free(full_snapshot);
   free(script_snapshot);
 }
 
 
 TEST_CASE(IntArrayMessage) {
   StackZone zone(Isolate::Current());
@@ skipping 981 matching lines @@
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse123456æøå3.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart